SunZia Transmission: enabling 3 GW of renewable power across the U.S. Southwest
Customer Story | 1 min read
The SunZia Transmission project is the largest renewable energy infrastructure initiative in the United States. Spanning roughly 885 km (550 miles) between Corona, New Mexico and Pinal County, Arizona, the system is designed to enable the delivery of up to 3,000 MW of clean wind power to population centers across the Southwest region.
As part of this landmark development, Hitachi Energy is supplying HVDC Light® technology, MACH™ digital control platform, and advanced power semiconductors to ensure efficient long‑distance transmission, grid stability, power quality, and reliable integration of renewable generation
Challenge
Solution
Grid‑forming control to stably integrate 3.5 GW of renewable generation into a weak grid
±525 kV voltage & reactive power control stabilizing an 885 km corridor
High‑efficiency power conversion (+30%) enabled by next‑generation semiconductors
MACH™ automation ensuring coordinated control across SunZia East & West Converter Stations
AC Chopper technology to immediately restore power if it is temporarily interrupted by weather and other contingency events.
Impact
Deliver clean power to approximately 1 million homes
Expected to generate $20 billion dollars in total economic benefit, including direct, indirect, and induced economic benefit as well as fiscal impacts
Reduce significantly CO2 emissions (approx.9 million tons)
Over 2,000 construction jobs created during its peak phase. 100-150 permanent jobs when it is fully operational
Enhancing grid stability through HVDC Light® inherent control capabilities enabled by advanced power semiconductors
UN Sustainability Goals
Return to the Grid-enSure®
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